Finding the Fourth Proportional to 13,108.10, 18,089.33 and 7,139.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,108.10 : 18,089.33 = 7,139.82 : x
2. Step 2: Convert to fraction form
   13,108.10/18,089.33 = 7,139.82/x
3. Step 3: Cross multiply
   13,108.10x = 18,089.33 × 7,139.82
4. Step 4: Simplify right side
   13,108.10x = 129,154,560.12
5. Step 5: Solve for x
   x = 129,154,560.12/13,108.10
6. Step 6: Final answer
   x = 9,853.03